Parabola Construction with "Angry Birds"

Topic:
Parabola
The goal of "Angry Birds" is to slingshot an arsenal of birds in a parabolic curve to destroy egg-stealing pigs. Can you construct the parabolas necessary to hit all the pigs? Move the directrix and focus to create new a new parabola, and then drag the "MoveMe" point back and forth to trace the parabola. Don't forget to clear the screen (ctrl-F on PCs) every time you want to try a new parabola. The "Angry Birds" property is owned by Rovio Entertainment LTD. Visit their website at http://www.rovio.com/ The image used in this GeoGebra applet is from http://dandroidtabletpc.com/download-angry-birds-seasons-hd-1-3-0-android-apk.html/